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The Recommended Dietary Allowance (RDA) is the average daily dietary intake level that is sufficient to meet the nutrient requirements of nearly all (97-98%) healthy individuals in each life-stage and gender group. Unlike many other nutrients, there is insufficient evidence to establish an RDA for vitamin D. Instead, an Adequate Intake (AI) -- a level of intake sufficient to maintain healthy blood levels of an active form of vitamin D -- has been established. The 1998 AIs for vitamin D for adults are the same in males and females, but increase with age. * Ages 19-50: 200 International Units (IU) * Ages 51-69: 400 IU * Age 70 and older: 600 IU I hope this is helpful :)

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